Remove redundant connection check.

The check already exists in CloseConnection(). All other connection close code paths don't check connection beforehand. And these two paths should do the same.

gfe-relnote: code cleanup, not protected.
PiperOrigin-RevId: 267229004
Change-Id: I197439d426bb181d87b428315b10af11cedbeabc

quic/core/quic_session.cc

diff --git a/quic/core/quic_session.cc b/quic/core/quic_session.cc
index 57de377..23935b3 100644
--- a/quic/core/quic_session.cc
+++ b/quic/core/quic_session.cc
@@ -1124,11 +1124,9 @@
     QUIC_LOG_FIRST_N(ERROR, 1)
         << "Peer sent us an invalid stream flow control send window: "
         << new_window << ", below minimum: " << kMinimumFlowControlSendWindow;
-    if (connection_->connected()) {
-      connection_->CloseConnection(
-          QUIC_FLOW_CONTROL_INVALID_WINDOW, "New stream window too low",
-          ConnectionCloseBehavior::SEND_CONNECTION_CLOSE_PACKET);
-    }
+    connection_->CloseConnection(
+        QUIC_FLOW_CONTROL_INVALID_WINDOW, "New stream window too low",
+        ConnectionCloseBehavior::SEND_CONNECTION_CLOSE_PACKET);
     return;
   }
 
@@ -1147,11 +1145,9 @@
     QUIC_LOG_FIRST_N(ERROR, 1)
         << "Peer sent us an invalid session flow control send window: "
         << new_window << ", below default: " << kMinimumFlowControlSendWindow;
-    if (connection_->connected()) {
-      connection_->CloseConnection(
-          QUIC_FLOW_CONTROL_INVALID_WINDOW, "New connection window too low",
-          ConnectionCloseBehavior::SEND_CONNECTION_CLOSE_PACKET);
-    }
+    connection_->CloseConnection(
+        QUIC_FLOW_CONTROL_INVALID_WINDOW, "New connection window too low",
+        ConnectionCloseBehavior::SEND_CONNECTION_CLOSE_PACKET);
     return;
   }